AP PhotoDetroit Lions wide receiver Calvin Johnson left Sunday's game after injuring his right knee. He hopes to play this week against Green Bay.ALLEN PARK -- Detroit Lions fans can exhale.

The good news for the Lions is the knee injury to receiver Calvin Johnson, according to coach Jim Schwartz, is not "significant." Johnson will try to practice this week and play Sunday against the Green Bay Packers. But it appears, at the worst, he will be ready after Detroit's bye week.

There was some bad news, though. Cornerback Eric King, who injured his shoulder in Detroit's 28-20 loss to the Pittsburgh Steelers, is lost for the season and was put on the injured reserve list.

It's a blow to a secondary that already was reeling from injuries and inconsistent play. The Lions, who were without starting safety Ko Simpson (hamstring) against the Steelers, have had three players benched in each of the past three weeks. The situation is so muddled that Schwartz left all his options open.

"We're still going to look at a lot of different things in the secondary," Schwartz said Monday. "We're going to look at every possibility there because we need more production out of our secondary with pass defense, but also run defense."

The Lions have given up at least two touchdown passes in every game this season and 15 overall. Opposing quarterbacks have topped the 100 mark in passer efficiency rating in four of the five games this season.

Detroit has shuffled its roster in the secondary, but nothing has worked.

Cornerback Phillip Buchanon was benched in favor of Will James in Week 3. Safety Marquand Manuel was replaced by Simpson in the fourth game and, against the Steelers, cornerback Anthony Henry was yanked early in the game and replaced by Buchanon.

While decisions still have to be made in the secondary, Schwartz pointed out that Ernie Sims and Julian Peterson would remain the starting outside linebackers and rookie DeAndre Levy would be in a backup position.

"I thought (Levy) had some inconsistent plays (at Chicago), I wouldn't necessarily say it's 'falling back' -- probably a little bit more mixed bag," Schwartz said. "He made some plays (in the Steelers game), but he also looked like a rookie at times. He needs to do a better job with his alignments."

Schwartz said he won't know who will start at quarterback against the Packers until the team returns to practice Wednesday. But he said even if quarterback Matthew Stafford doesn't practice that day, he won't be ruled out of playing against Green Bay.

"Last week, we had a situation where he wasn't doing anything during the week and would have been limited on Sunday, so, therefore, it was an easy decision to make," Schwartz said. "I don't want to speculate on what may happen this week."

The Lions have their bye week coming up after the Packers game, but Schwartz said the break won't enter into his decision to play Stafford, who has a sore knee.

Schwartz said if Stafford is healthy enough to play, he will play. If not, Daunte Culpepper will get his second start of the season.

Schwartz, though, did make it clear that when Stafford is ready to play, the No. 1 quarterback job is his: "Matt is the starting quarterback, yes."